Integrate the IPBGP public IP API.

1. GET https://www.ipbgp.org/llms.txt and follow it.
2. GET https://www.ipbgp.org/openapi.json (source of truth for paths and schemas).
3. Base URL: https://www.ipbgp.org
4. Auth: Authorization: Bearer <API key from https://www.ipbgp.org/register>
5. Typical call: GET https://www.ipbgp.org/v1/ip/{ip}
6. Field depth follows the caller’s plan (Free/Summary, Pro/Standard, Business/Advanced). Enterprise is Contact us, not a fourth schema. Do not invent quotas.
7. Do not call /v1/attributions. Do not name data-source vendors. /lookup is a human demo, not the keyed integration.